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// prune extraneous packages.
module.exports = prune
prune.usage = "npm prune"
var readInstalled = require("read-installed")
, npm = require("./npm.js")
, path = require("path")
, readJson = require("read-package-json")
, log = require("npmlog")
prune.completion = require("./utils/completion/installed-deep.js")
function prune (args, cb) {
//check if is a valid package.json file
var jsonFile = path.resolve(npm.dir, "..", "package.json" )
readJson(jsonFile, log.warn, function (er, data) {
if (er) return cb(er)
next()
})
function next() {
var opt = {
depth: npm.config.get("depth"),
dev: !npm.config.get("production") || npm.config.get("dev")
}
readInstalled(npm.prefix, opt, function (er, data) {
if (er) return cb(er)
prune_(args, data, cb)
})
}
}
function prune_ (args, data, cb) {
npm.commands.unbuild(prunables(args, data, []), cb)
}
function prunables (args, data, seen) {
var deps = data.dependencies || {}
return Object.keys(deps).map(function (d) {
if (typeof deps[d] !== "object"
|| seen.indexOf(deps[d]) !== -1) return null
seen.push(deps[d])
if (deps[d].extraneous
&& (args.length === 0 || args.indexOf(d) !== -1)) {
var extra = deps[d]
delete deps[d]
return extra.path
}
return prunables(args, deps[d], seen)
}).filter(function (d) { return d !== null })
.reduce(function FLAT (l, r) {
return l.concat(Array.isArray(r) ? r.reduce(FLAT,[]) : r)
}, [])
}
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